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You guys bleeding your truck brakes regularly?

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You guys bleeding your truck brakes regularly?

Old 02-21-2019, 05:28 PM
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Default You guys bleeding your truck brakes regularly?

Iíve seen some threads on trailer bleeds but are yíall bleeding your trucks brakes on a regular schedule?
i let mine go quite a while (fluid got pretty dirty) but have been bleeding the calipers and proportioning valve with my home made version of the motive pressure bleeder every year now. The first time I did get moisture out closest to the nipples in the form of a rusty substance about 2 tablespoons worth in each corner before it cleared a bit. It took a quart of brake fluid to do the whole system. I had to do three full bleeds to get the system totally clean. After the first bleed I went on a muddy road and repeated the antilock system by locking the brakes up. Then I bled it again and repeated the muddy road, then did the final bleed.
Old 02-21-2019, 05:31 PM
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Iíd be amazed if 2% surveyed do. Make the survey - Iím curious!! (I do but I drank the Chrysler Service Department koolaid years ago. Of course I ALSO have 302k on my 96 Pathfinder with original parts. Go figure.)
Old 02-21-2019, 05:31 PM
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Brakes are a sealed system. You shouldn't need to bleed them unless you have a problem (leak). Closest thing I do is crack the bleeder when I'm pushing the pistons back in during a brake job. This pushes out all the fluid that *may* have been exposed to high heat in the caliper. Then just top off the master cylinder.
Old 02-21-2019, 05:33 PM
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Brakes, transmission, engine... itís oil. Itís hydrographic and affected by heat. You do what you feel good about and Iíll do the same. To each his own.

edit: hydroscopic 😀

Last edited by WeeKilt; 02-21-2019 at 05:49 PM.
Old 02-21-2019, 05:34 PM
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Never. The only time I've ever bled brakes if if I did a repair that let air into the brake lines.
Old 02-21-2019, 05:36 PM
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Iíve never done it on any of my trucks. Used to not keep them past about 70,000 though. Current Chevy is at 160,000 and never been done.

timely thread though, wifeís Mercedes is coming up on a maintenance interval that Mercedes calls for brake system flush - probably go ahead and do it.
Old 02-21-2019, 05:38 PM
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Every 2 years.
Its the BMW in me.
Old 02-21-2019, 05:40 PM
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Never....
Old 02-21-2019, 05:40 PM
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Originally Posted by ChrisW21 View Post
Brakes are a sealed system. You shouldn't need to bleed them unless you have a problem (leak). Closest thing I do is crack the bleeder when I'm pushing the pistons back in during a brake job. This pushes out all the fluid that *may* have been exposed to high heat in the caliper. Then just top off the master cylinder.
while thatís somewhat correct - the brake fluid is actually HYDRYOSCOPIC and will add water from the air over time.
Adding/giving you a spongey pedal over time.
Flush them every 2-3 years.
Old 02-21-2019, 05:40 PM
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Originally Posted by myyellas2k View Post
Every 2 years.
Its the BMW in me.
Same. Flush though, not really bleeding.
Old 02-21-2019, 05:41 PM
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Mrs Subaru Outback has brake fluid flush at 30,000 miles as maintenance item if I’m not mistaken. Brake fluid is supposed to attract moisture or something like that through the hot cold process. Doing the truck really firmed up the peddle
Old 02-21-2019, 05:43 PM
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Put a new front caliper on the Super Duty this week, and believe my wrench did not fully bleed the system. Pedal is a bit mushy.
Will do a drive-by tomorrow.
Old 02-21-2019, 05:47 PM
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I understand doing the push on brake peddle crack bleeder, close release brake pedal is bad for the master cylinder. You stand the chance of pushing past the well worn area and cause a leak in system . It’s best to gravity bleed or pressure bleed.
Old 02-21-2019, 05:51 PM
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Originally Posted by alligatorgar View Post
I understand doing the push on brake peddle crack bleeder, close release brake pedal is bad for the master cylinder. You stand the chance of pushing past the well worn area and cause a leak in system . Itís best to gravity bleed or pressure bleed.
Always gravity bled my old Land Rover Series IIA but everyone is in SUCH an effing hurry these days...
Old 02-21-2019, 05:52 PM
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I flush my brake systems every couple of years on my vehicles. But that's not bleeding them, its replacing the fluid so they dont rust the lines from the inside out.
Old 02-21-2019, 05:59 PM
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Originally Posted by WeeKilt View Post
Brakes, transmission, engine... itís oil. Itís hydrographic and affected by heat. You do what you feel good about and Iíll do the same. To each his own.

edit: hydroscopic 😀
Originally Posted by myyellas2k View Post

while thatís somewhat correct - the brake fluid is actually HYDRYOSCOPIC and will add water from the air over time.
Adding/giving you a spongey pedal over time.
Flush them every 2-3 years.

Since you guys think you are smart enough to know a big word like "hydroscopic" (which by the way is WRONG, its HYGROSCOPIC) answer me this.

If a brake system utilizes ~800 psi for a normal stop and ~2000 psi for a hard stop, without leaking, how is the ~14 psi of atmospheric pressure allowing moisture into the system?
Old 02-21-2019, 06:01 PM
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Dunno. I service my vehicles and they run great. You do what you want with yours. Iím Scottish so my spelling has always sucked.

But hereís what the experts say: https://www.google.com/amp/s/blog.am...id-go-bad/amp/
Old 02-21-2019, 06:04 PM
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Never and I have 1 million miles on a lifetime of diesels that actually pulled stuff
Old 02-21-2019, 06:04 PM
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Never. But that's why I but Chevy's, don't have to baby them.
Old 02-21-2019, 06:04 PM
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This thread reminds me a LOT of that stupid transmission thread.

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